These are not formally SPARQL 1.1 services but they may help:

sparql.org executes SPARQL 1.1 ish queries.

The validator
http://www.sparql.org/validator.html

has "SPARQL" and "SPARQL extended syntax", which is 1.1-ish (and LET).

prefix dbpedia-owl:
prefix dbpedia-owl-uni:
prefix dbpedia-owl-inst:

select ?town count(?uni) ?pgrad ?ugrad max(?population) ((
(?pgrad+?ugrad)/ max(?population))*100) as ?percentage where {

The select expressions will need AS in the final SPARQL 1.1 spec.

( ((?pgrad+?ugrad)/ max(?population))*100 as ?percentage)

?uni dbpedia-owl-inst:country dbpedia:United_Kingdom ;

dbpedia: not defined!

dbpedia-owl-uni:postgrad ?pgrad ;
dbpedia-owl-uni:undergrad ?ugrad ;
dbpedia-owl-inst:city ?town.
optional {?town dbpedia-owl:populationTotal ?population . FILTER
(?population>  0 ) }
}
group by ?town ?pgrad ?ugrad having( (((?pgrad+?ugrad)/
max(?population) )*100)>  0)
order by desc 6

What's that?  Was 6 col 6 i.e. ?percentage

        Andy


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